Toyota AURIS User Manual page 215

Raindrop sensor (vehicles with rain-sensing windshield wipers)

 If the wiper switch is turned to the "AUTO" position while the "POWER"
switch is in ON mode, the wiper will operate once to show that "AUTO"
mode is activated.
 If the temperature of the raindrop sensor is 90C (194F) or higher, or
-15C (5F) or lower, automatic operation may not occur. In this case,
operate the wipers in any mode other than "AUTO".
 If no windshield washer fluid sprays
Check that the washer nozzles are not blocked and if there is washer fluid in
the windshield washer fluid reservoir.
CAUTION
 Caution regarding the use of windshield wipers in "AUTO" mode (vehi-
cles with rain-sensing windshield wipers)
The windshield wipers may operate unexpectedly if the sensor is touched or
the windshield is subject to vibration in "AUTO" mode. Take care that your
fingers or anything else do not become caught in the windshield wipers.
UK_AURIS_HV_EE
2-3. Operating the lights and wipers
 The sensor judges the amount of rain-
drops.
An optical sensor is adopted. It may not
operate properly when sunlight from the
rising or setting of the sun intermittently
strikes the windshield, or if bugs etc.
are present on the windshield.
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